Justin Bieber is definitely making a more mature musical statement on his June 19 release, Believe. However, his manager notes that just because the 18-year-old sounds older, doesn't mean that the baby bird is ready to leave the nest just yet.

"Adult artist? Just because he's legal now doesn't mean he's an adult," his manager, Scooter Braun, told Billboard about the growing pop star. "He still needs guidance; he's still finding his way. He's no longer a boy, but he's definitely not yet a man."

During the interview, Braun also notes that Bieber has more pressure on him than pop stars before as he has come up in the digital age. He added that he's essentially a one-man boy band who can't rely on the support of other group members.

"No one in the history of the world has ever grown up with the pressure that he has, being a solo artist that young, that famous, in a world with technology that exposes us 24/7," Braun adds. "He was literally going through puberty in front of the entire world, with everyone expecting something from him and a lot people waiting for him to screw up. He's a fighter. I'm proud of him — how's he's stayed true to himself and taken control of the entire situation."

The singer himself recently opened up about his public image and how he always feels guarded in interviews. "I mean, I keep my guard up a lot, because you know, you can't trust anyone in this business," Bieber told the June issue of GQ. "That's what's sad. You can't trust anybody. I learned the hard way."

And given his busy promotional schedule, Bieber will have a lot more interviews to give in the coming weeks. He is traveling the globe promoting the release. He's already made stops in Oslo, Norway, Paris and Mexico City, among others, and this week touches down in New York City where he will appear on the "Today" show.